:root { color-scheme: light; --ink: #1f2a33; --muted: #5b6770; --line: #dfe5ea; --accent: #1f6f5f; --accent-soft: #eaf3f0; --bg: #fbfbf9; --card: #ffffff; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif; color: var(--ink); background: var(--bg); line-height: 1.8; font-size: 16px; }
a { color: var(--accent); }
code { background: #eef2f4; padding: 1px 6px; border-radius: 4px; font-size: .95em; }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--card); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px; }
.brand { font-size: 22px; font-weight: 700; letter-spacing: .08em; color: var(--accent); text-decoration: none; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }

.hero { padding: 56px 0 40px; }
.hero .eyebrow { color: var(--accent); font-size: 14px; font-weight: 600; letter-spacing: .06em; margin: 0 0 8px; }
.hero h1 { font-size: 30px; line-height: 1.4; margin: 0 0 12px; }
.hero p { margin: 0 0 10px; color: var(--muted); font-size: 17px; }
.hero .cta { margin-top: 20px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 6px; border: 1px solid var(--accent); color: var(--accent); text-decoration: none; font-weight: 600; background: var(--card); }
.btn.primary { background: var(--accent); color: #fff; }

section { padding: 36px 0; border-top: 1px solid var(--line); }
section h2 { font-size: 21px; margin: 0 0 16px; }
section h3 { font-size: 17px; margin: 22px 0 8px; }
p, li { margin: 0 0 10px; }
ul, ol { padding-left: 1.3em; }
dl { margin: 0; }
dt { font-weight: 600; margin-top: 12px; }
dd { margin: 0 0 4px; }

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 8px; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 18px; }
.step .num { display: inline-block; width: 28px; height: 28px; line-height: 28px; text-align: center; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; margin-bottom: 8px; }
.step h3 { margin: 0 0 6px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.feature { background: var(--accent-soft); border-radius: 8px; padding: 18px; }
.feature h3 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; font-size: 15px; }

.faq dt { font-weight: 600; margin-top: 16px; padding-left: 1.4em; text-indent: -1.4em; }
.faq dt::before { content: "Q."; color: var(--accent); margin-right: .4em; }
.faq dd { margin: 4px 0 0; color: var(--muted); }

.note { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 4px; }
.warn { background: #fdf3ec; border-left: 4px solid #c2672a; padding: 12px 16px; border-radius: 4px; }
.meta { color: var(--muted); font-size: 14px; }

table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { width: 30%; color: var(--muted); font-weight: 600; }

.site-footer { border-top: 1px solid var(--line); padding: 28px 0 48px; color: var(--muted); font-size: 14px; }
.site-footer .links { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 8px; }
.site-footer a { color: var(--muted); }